1350-O -- highest-conductivity standard aluminium (61% IACS). For power transmission overhead lines (ACSR/AAAC), busbar and transformer winding where electrical conductivity dominates material selection.
EN AW-1350 (Al99.5E) per EN 573-3 and EN 60889. Tight control of Fe, Si and Ti gives 61% IACS -- the highest standard wrought Al conductivity. O temper for maximum ductility in wire drawing for overhead power line conductor applications.
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